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由于生產的連續性，彩涂板生產單位需要及時反映生產過程中工藝參數的變化，監控彩涂板的涂層厚度。一旦發現偏差，應立即進行調整，以確保生產過程穩定可控，從而降低制造成本，降低不良品或廢品的概率，全面提高產品質量。
從理論上講，彩涂板可采用以下三種方法在線檢測彩涂板的漆膜厚度：首先，采用紅外光譜吸收法檢測漆膜厚度。其檢測原理是根據有機涂料的特征元素官能團定量檢測紅外光譜，但不同顏色、不同涂料供應商提供的有機涂料的紅外特征官能團不同，如果要準確檢測涂層厚度，每個油漆供應商需要為每種顏色的油漆建立一個檢測模型；對于用戶來說，這意味著彩涂板至少需要建立500個紅外探測工作模型，并且需要定期檢查和維護工作模型。因此，紅外光譜吸收法在線檢測涂層厚度沒有實際應用價值。其次，采用激光測厚在線檢測系統。激光測厚的原理是通過控制激光光源在彩涂板上鉆一個直徑約為0.5mm的特定形狀的小孔，然后用顯微鏡測量小孔斜率的長度，然后通過數學模型計算涂層厚度。這種方法是一種破壞性試驗，它破壞了涂層的完整性，彩色涂層板的耐腐蝕性在使用過程中降低。第三，彩涂板采用渦流在線檢測系統。這種方法不需要制作數百個檢測模型或打孔。是一種比較有效的彩色涂布板涂層厚度在線檢測系統；但檢測系統為接觸式檢測，只有在機組停機時才能進行膜厚檢測。因此，渦流在線檢測系統的應用也受到限制，不能實現在線實時檢測。
Due to the continuity of production, the color coated plate production unit needs to timely reflect the changes of process parameters in the production process and monitor the coating thickness of the color coated plate. Once any deviation is found, it shall be adjusted immediately to ensure that the production process is stable and controlled, so as to reduce the manufacturing cost, reduce the probability of defective or waste products and comprehensively improve the product quality.
In theory, the following three methods can be used for on-line detection of coating film thickness of color coated plate: first, the infrared spectrum absorption method is used to detect the coating film thickness. Its detection principle is to quantitatively detect the infrared spectrum according to the characteristic element functional groups of the organic coating, but the infrared characteristic functional groups of the organic coatings provided by different color and different coating suppliers are different, If you want to accurately detect the coating thickness, each paint supplier needs to establish a detection model for each color of paint; For users, this means that at least 500 infrared detection working models need to be established, and the working models need to be inspected and maintained regularly. Therefore, the on-line detection of coating film thickness by infrared spectral absorption method has no practical application value. Second, the laser thickness measurement on-line detection system is adopted. The principle of laser thickness measurement is to drill a small hole with a specific shape with a diameter of about 0.5mm on the color coated plate by controlling the laser light source, then measure the length of the small hole slope with a microscope, and then calculate the coating thickness through a mathematical model. This method is a destructive test, which destroys the integrity of the coating, The corrosion resistance of the color coated plate decreases during use. Third, the eddy current on-line detection system is adopted. This method does not need to make hundreds of detection models or punch holes. It is a relatively effective on-line detection system for coating thickness of color coated plate; However, the detection system is contact detection, and the film thickness detection can be implemented only when the unit is shut down. Therefore, the application of eddy current on-line detection system is also limited and can not implement on-line real-time detection.
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